9. Brent is skiing down a mountain. If his altitude changes by-15 feet per second, what will be his total change in altitude after one minute? irections: Evaluate each expression. 1. -34 12./15 13.1- nic 2. Fraction Operations

Use the graph of the sine function y=2sinθ shown below

Ineed in figuring out this problem.

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?